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Design of Single Layer and Multilayer Triband Band Pass Filter for WiMAX and WLAN Applications
Abstract
In this paper microstrip triband band pass filters are proposed and investigated for the combination of WLAN (2.4/5.2 GHz) and WiMAX (3.52 GHz) applications on single layer and multi layer configurations. The performances of microstrip band pass filters on single and multilayer configurations are compared. The single and multi layer triband band pass filters are designed using stepped impedance resonator and open loop resonator. Multilayer structure is used to achieve compact size and strong coupling effect. A pair of resonators on the top layer is designed to operate at the frequencies of 2.4/5.2 GHz. The open loop resonators on the middle layer are designed to operate at the frequency of 3.5 GHz. The size miniaturization is achieved using multi layer structure. The pass band selectivity is also improved due to multi path propagation inside the multilayer structure. The proposed multilayer tri band filter has compact size, low insertion loss and good pass band performances compared to the single layer BPF. The simulated results are in good agreement with the measured results. PNA-L vector network analyzer is used for measurement analysis purposes.
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References
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